Section, acts Aug. 13, 1946, ch. 957, title VIII, 811, 60 Stat. 1020; Aug. 5, 1955, ch. 576, 10, 69 Stat. 537; Sept. 8, 1960, Pub. L. 86–723, § 33, 74 Stat. 839; Feb. 28, 1970, Pub. L. 91–201, title I, § 102(a), 84 Stat. 17; July 12, 1976, Pub. L. 94–350, title V, § 504, 90 Stat. 836; Aug. 17, 1977, Pub. L. 95–105, title IV, § 409(a), 91 Stat. 854, Ex. Ord. No. 12145, 1103, July 18, 1979, 44 F.R. 42653, related to rate of contributions to Fund.